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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bf68de5adac5b562bdd158c396db5beade3ab16c58f9ad4de198dffbce79228' 
  AND token = 'wkV+okwkFU9y4/jvv163OGj7HVUfuUsIYFjCH9Yq5j8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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