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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9d28cfb12e6e74cf876dae22db2d7d68fb9a130716cd3271dfd8a9895a21a4e' 
  AND token = 'APVcziw7jS50cOmQzfjoTdg3H40ts7yeTueIzinjAy0=' 
  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"
    }
  }
}