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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38acc2dbc9b2dd77461a4f9afb2104ceea0ad3e0810522d8c8bcad3f7f423258' 
  AND token = 'AXypvRAjDsQCPeOfgAJsQXo7ub3lhJno6KHNA0+o9ks=' 
  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"
    }
  }
}