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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfa0ae3266a4b5e7d723734a1bdc91b2bebf0e01e5c43727266954f17d5af096' 
  AND token = '39MTW4gd/jRFW1d9TuXd3OHURSKj2NL4Faeh4ekCM9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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