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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1b67caede308c1d26f352efa45dcea03bf6ed724e5083df21b7000a97e32e79' 
  AND token = 'Bmlu+R4g+OBwHXsi8+PfhAZcnuNTDuGXEszUdSDMAXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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