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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e83042a20deb0dc463848cb04b5995e5b6c54a03e47bc1b01753eea510076e8f' 
  AND token = 'v5eoxARNAJnw0GCf3sfQsjmcE6NoMH356TzaYicU8II=' 
  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"
    }
  }
}