SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08de0e4cfc28dc6742ff3127a94e83c3c326cb7bab0f5073b4d3ca154716ef22' 
  AND token = 'hZUT15u+oJlGzlOFaOdYgatSm5n6SRs/jbejlVlioMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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