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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efbe2068f88b43142e5e0d39ab4a99bf887610150d47103cacdaac2c1791aa54' 
  AND token = 'QoJE0V78o5SdmDy75wmrtW3lewHkEx9qghUqT8MQlqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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