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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a847cca3a32c6b90dec7eb26a6c91c9505dc30cd7a25cbf4f6ed67cc7ef052d' 
  AND token = '8rj2o+dOU81aPYMW2rTgRIfU3hHe0z1nczGRa1xByO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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