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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a08349f954134079519d71b52a8f0e85e0ef5677ac241c8542186ffb20171657' 
  AND token = 'W9Uy1GV+Vp/uqDQfnVP2OjH03MNzQ7TVVLzoK+n3HaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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