SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52dbf8362843d6aaa291b9ca7cbae58ee4e1b3cd325ba980c06f97b501b155bd' 
  AND token = 'Yzvj9FM11HphEmw6zOGLVQ3daBf3LLVADIwP4x/iFIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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