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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53920d6abe1cac7d145ba06caff091d24bcd02049cb20604f968a4049ecd2559' 
  AND token = '6gNXxEcgbD3iGFV5M+gyoLkO+ddjSz2RSiMzUtelw1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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