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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '452f9ac06b0130cff4f517228ea5b21d8440a6c1afad632eb226c941d66c8780' 
  AND token = 'zeRW6F4+P3YBR/FL+bbM11o0FhT4sxq1RQPTsyno6zg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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