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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '997a395fb84eeadf192fa08e46563bacaf55222553eb61308e82392b7d70df61' 
  AND token = 'Wn819oA+qqHfXnob58fcXN53vJjn0nH2semj5N38QGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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