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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2809aae97f4ef8b0747df2942339e8e40293d927e7dc3ab200f938f3b27efe42' 
  AND token = 'XzXfbPZL/O7u7a9wIRvhzoCVu4cv2rPxt1Iibuzan7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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