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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19cbae934ee15de10486c31d5ad74653bf2b63f93bf36609a93f43f7b53aa06a' 
  AND token = 'eCM21hyXnvatcpLh1Edgl4RE15wxrjY8rENz5560cwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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