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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dded39dd35fb0517d53ffb5bc2dd957217f59f68f77bf448038cad87e7a9838' 
  AND token = 'T8ir64jyRBl2IkknHKau49laCbIiy/il3zG0PIN4Xwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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