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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9191f244d606f2ed8dc07181d54ec01d5b3282900ebfb2bde85beb59b8308b8' 
  AND token = 'MRbYU5q5GwQpnUUrGAX6/32J8e9CGXlPieyFpXKNIh0=' 
  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"
    }
  }
}