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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd445691307c229687dcf68011404816d318f8ad056dd14be02b3da52371822d' 
  AND token = '59c5FhpzCYTU6dKk/8xhSr0QfTiUgobSxmLp6y5qQzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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