Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1a785c4bf20860ad6c5c9e4b8f4b8ad35994b319c3f84e51dcd6fd7d317e738' 
  AND token = 'p0yfqdw8O9WOBXizVmDsrNVn25WRgoP9omtaF73W8Cg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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