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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b2f45713913822fed99e75e70e1241bb4088727cbdf22f4aff604bc82def4fc' 
  AND token = 'uuMhL7mcKp5wccQa1S+bFW6FJFVm9jRJYsdbMvAKX4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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