SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74c8d4f8d5e0dc839499734cdb2f0657bfbc41fd606f5dae8b167786b49b7ae2' 
  AND token = 'aHbL/pQhIZTB+wXaEpFRRXFvZewhq6rJGoxV7yW54LE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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