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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4146535e59ec3ef8ef6322b0f1fec4e94c5d8834aaee8d58d57599e72f3321c9' 
  AND token = 'TxRSYD8AUo422DumE10ezQuIl2fVBFyqUOeznU5StC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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