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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3f1dd0478efee7959c193faf9b554a23c8b806f6c834f97b83dc10646e4b4eb' 
  AND token = 'pH0qqYz62YKGNy+F8R0OBl2W03g4YkpHodRoLg2guRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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