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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5671ccb76d19b9b2fd303278a503acf123fb29c40a74354c614e977b72c1f226' 
  AND token = 'gZtswM0SKGBNwcQdUFhOd4fxO/sk0V0p8kn6U6Dh8Io=' 
  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"
    }
  }
}