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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39a6267c0209e1b699b4878140f777ee4d66a5d073d03bb7a5fc234a8ce99fc1' 
  AND token = '0y/s8VhDcCuu7Um0mvFn0no+npI0wKVSvGy1dZHQprE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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