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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1749fc75bb0c2f5a1e9e06830a7dcdb84c2630cefd822b46d3f330c2b15df3ef' 
  AND token = '7Gn32yCKwQnyoYVyG9h+NZ0QZE9z0DaFUPkSTfDlB3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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