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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29fc522cc33b16084af0ca014d9963689313948c1c8f97710787cc1ead397a9c' 
  AND token = 'rKMi/Fk/gMQAU6GIGFRNU0/HAqw+ryycM18Maj9oftA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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