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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ed8b0494dee09cd829d67192a520eed7d09b2c32e11b868964f353f7a9bb6d8' 
  AND token = 't55XCNmh9oNiMrZuluibkncIeEI3ri5CTcqPurPo15o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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