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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83f80e77e3efe212c353ba115589fc277c61e866b8a0a4b248ca572192517d2e' 
  AND token = 'EZ3lS9OdQdP03TmjHNScnTrASIaNVt52aRSSN0d/m/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}