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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d028ee7ceb902765431d9df0842baf66a1d241797963261030522a3dca47c32' 
  AND token = 'Nywq4/mQ9X6qsU2gb3Ks14HWnOm5FNi/EIl66wIkb14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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