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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ded43a65a689b63295bbd4e779dc731dd25200566b0c2e1c901f8191377908d' 
  AND token = 'tGVpE8UN1WkvNWvY/Jxn+RRcyCqtFmSec7me42wPEw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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