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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94ae51708dba8365190753dcbc9a32c639a8124139587c558e6313042c80bf91' 
  AND token = 'VkZrXJM92ZHeFKI4IezBzfItgcyaK/rfx76Y/HQKKPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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