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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e655bc9113b0fd952f76ad5baa0410b0bac075e9df87e8368841e5adb7739ad' 
  AND token = 'DB9h16YcajSzZ5iXyKjVTyFLmUUlemuJ0+oiI7C8z1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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