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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b1a4fe846cad6d77bc50f75885d9fc83c8f199e40b8d4f77b34bd1315f087cc' 
  AND token = '5NP6IvMj5vHgPYbjS9XU6au9B0PD7qBwtIvXInm1kec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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