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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e58d7e6af7e0d621d30dbcf786eda3357c428c08aff1def44310c8c7e49a795' 
  AND token = 'jsSm0PyNXcmWivwiQxRO2InctmYyp5DUB3T5qehuCp8=' 
  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"
    }
  }
}