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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ffe71c31aa6bfec692024ca5c3123399677339c2be3761933d287ba3edf6f2c' 
  AND token = '5l6q3ScQ/bD3CulJcFYiGkOyknPQb+GdCwm4BJ50nB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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