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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ec4a264467c742f0c0010b170f5f6e18f0b0894b6ed4e338b246bf0564edd24' 
  AND token = '6V3MBj6McrxgQEgR6euoDZ/tA1UxjdtjHY+9L8S/zfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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