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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6eaa000f2c66c1b2a77521c9af70663b4d7853f8f04f77b62468094af7ec218' 
  AND token = 'TE7/E0JUEz20+Ui+RvGsF5pjA2nC1rjgpCw4YwLVU5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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