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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d9d4a9762a41ca37675c1b0f4d882fb064d50dcedd1c8591ba41b647ea3f6a6' 
  AND token = '09hnmXEwtjxJlCjmq0GZDyezPE1lak6oaf5EaynLgaI=' 
  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"
    }
  }
}