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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3135df8ea54f064212b4af56a39f9619b1c922e1857a996bccc374c0eb735ff3' 
  AND token = 'UDeLqS834zvN1gu32w/Ie942Uze1OWzifZmKn+7S0ZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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