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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '341a3b45c1277d71751ef9608d0d5bba9d0f544c9c6ffd60ccbea87b901f4b3b' 
  AND token = 'CIoifP3gPiuyZzoT+MiTxyTm7MEsO7hWJyIwbTskf7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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