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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '826516f1ea22d249a15eed5281c3d70a8524cf8ccebf06082b6bf3cb0c688d0f' 
  AND token = 'IMtIf/A5pyylpIINa3mztSWNt8DVzP1lpiQgWT1UmNg=' 
  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"
    }
  }
}