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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a598c15cb822ae51fd10dcc6d57f1ab70b0fd47369b869beabfbc1be1f374f3d' 
  AND token = 'WZY3wEIBfqisCD+1LAzPnAqLKQkgzCNTtn6gkJat3mo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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