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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09bc0e012ec7306b39a88aee999476ed7cc9aedc7f9e7517a8a7e0018e17e07f' 
  AND token = 'mdcrDXPF84G6dKFQq0FmY0dEsDd2aQswru/XGy9z+ys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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