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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63d522e0de45a5ba84b49c024968ed73e6f1267966bbc5e9d6c61684dd61f4ee' 
  AND token = 'FVeQt9ep6yQGy6otabpCmBxDuAJ29+epXUwly8e1lHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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