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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c078fedf9029d8ac3e9dd55b1e00a98e8944ce977220cbedfef2b27e8caa72e' 
  AND token = '7vHNuIaN8hFvOL/qTeXirQRvT/zLDV8FcebA0Ir5HRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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