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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e5398df322f6d380b1375eb3b3734adbf7077f8ef3ace0c175269eed00b1093' 
  AND token = 'Vu7by8asntA7nLa2GVRlxf90Yy4ZrEmhyaGm1cNxx4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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