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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9154277ff59fe282db39e8ec3350e7e88d5415fb640ac7ed4ec3eee58a4c893' 
  AND token = 'O60tLSqgE+W5onNJwb+/72Rc8+5Cmc/ZPdQ4/HZWgwQ=' 
  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"
    }
  }
}