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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5a3e5ab14d14bbc70d6ec5a0c471c8ebbd352e8ed44a32df03996632c0d2256' 
  AND token = 'iVAs63oPdoOZcIpd2gXZ/0BOzbKLKgATbqbn64eQwMA=' 
  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"
    }
  }
}