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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3248352dfa85cd06c56e8b9de79934ec9c17bb8684599247efe8af4ba0cf8f44' 
  AND token = '04vSbRkgp8Tle5OmCJcRZHYMvFDvgEkQfiyipZEO8+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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