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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20b35023d8e4a7d558a25793024e3c103641a2b668cd31a82b9b54bf2bc73ba7' 
  AND token = 'hMK4Aa+yj4Jp11SULblj6Wdy3fMm3kDdO9fteS4JFMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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