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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '789c18ce6dd9b67c7dc6258b1ab4ffad054848379cbdbccd34c5baacab5edb9a' 
  AND token = 'VT+pbKn8s47us1lIoUuc2hMdV1KX4Jq4mle/4A9tjs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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