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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da703f7f4b07a52dd17fd7d5cd7cf0c2d394e4493e9cf33b10329ffd056d5838' 
  AND token = 'BVu3XeuyX8HMVOqdHsN8CE4/qtcqC8DuMk3uOoBdl2Y=' 
  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"
    }
  }
}