SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '195705ae87859136a460948f078ab88d54bdd32e9b7993482d6bda6cbcaee126' 
  AND token = 'rsMIitHN3BHvLFY0HnhD6IxozSxqw8ZjpHRTBGf/Y1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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