Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f64c4556f02b62cd0be8671ceccc919c85337fe2abdf2d7c7d2192be91e0738e' 
  AND token = 'b7rmug+d62kK2qj8YFiqKyGeVHIIneLb8Em5GW0bsWo=' 
  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"
    }
  }
}