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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfeb7390799964df38ac5240e24b8e086b8357168386c17823fb3fb87a2f9520' 
  AND token = 'ADwV1fb7joekzkJsVxAgoQDw7N/o/IyO6MU931LiWUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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