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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9fec04d7fb15f9e540deaf51ec7e11e33eba6a8c3b49d7ec46e5c20c5e3e11f' 
  AND token = '1XOuvY3epJ45OCgFHlyBXkFyEu2Z8+6DSLQ0KrhwfRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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