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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb0a4aa3e3ebbf5d24042f835cba7a2a122f9b5349519fd3343120590ea273d9' 
  AND token = '+UG6TFfKraTwH8c/bEgWmrZ87VoyQP4/KAEZU3mGCfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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